Marble Arms .343'' Fiber Optic Glow 34-Mr Front Sight Steel Green

The Marble Arms .343" Fiber Optic Glow 34-Mr Front Sight in steel green is a ramp-mounted rifle front sight built for shooters who want a visible, durable aiming point in low light or variable conditions. The green fiber optic rod—0.060" in diameter—glows naturally under ambient light, giving you a bright aiming reference without batteries or electronics. This is a no-nonsense sight that pairs durability with practical visibility, ideal for hunters and riflemen running traditional open-sight setups or as a backup to optics.

The sight features a gracefully contoured blade that slopes toward the front, a design that reduces glare and wind resistance while maintaining a clean sight picture. Built from blued steel, it resists corrosion and complements the finish of most modern and vintage rifles. The ramp-mount design with a 0.340-inch-wide base fits standard dovetails and bases found on factory rifles and aftermarket mounting systems.

If you're setting up a rifle without a scope, prefer mechanical backup sights, or need a quick-acquisition aiming solution, the green glow tube makes acquiring your target easier in dawn, dusk, or overcast conditions. Marble Arms sights are built to last—no moving parts, no adjustments to creep, just solid steel and proven sight geometry.

Key Features

• Green fiber optic rod (0.060" diameter) for low-light visibility
• Ramp-mounted design with 0.340" wide base for standard dovetails
• Contoured blade design reduces glare and wind signature
• Blued steel construction for durability and corrosion resistance
• No batteries or electronics required

Specifications

Frequently Asked Questions

Will this front sight work on my rifle?

The Marble Arms .343" sight uses a ramp-mount base and fits standard dovetails found on many factory rifles and receivers. Check your rifle's mounting system to confirm it has a compatible ramp base or dovetail slot for a 0.340"-wide sight.

How bright is the green fiber optic in low light?

The fiber optic rod glows passively under ambient light—it doesn't require batteries or an external light source. Visibility depends on available light; it will be most noticeable in dawn, dusk, and overcast conditions.

Can I use this as a backup sight with a scope?

Yes, many hunters and tactical shooters mount fiber optic iron sights alongside scopes as a backup or emergency aiming solution. As long as the sight doesn't interfere with your scope's eye relief or mounting, it works well in a dual-sight setup.

What's included with the sight?

You receive the front sight itself. Installation typically requires a properly fitted ramp base or dovetail on your rifle; gunsmithing or professional installation may be necessary depending on your rifle's current setup.